S-95198A447 4-40 x 1/2" ASME B18.3, DIN 912, ISO 4762 Sealing Socket Head Screws

Key Features & Benefits at a Glance

• Superior Sealing Performance: Viton® Fluoroelastomer O-Ring ensures leak-proof integrity under high-pressure conditions up to 1500 psi, ideal for hydraulic and pneumatic systems.
• Exceptional Temperature Resistance: Operates reliably in extreme environments from -20° to 400° F, maintaining seal elasticity and screw integrity.
• High Tensile Strength & Durability: 100,000 psi tensile strength and Rockwell B85 hardness provide robust, long-lasting fastening for heavy-duty applications.
• Precision Thread Fit: Class 3A UNC coarse threads ensure accurate, secure engagement with reduced risk of cross-threading or loosening.
• Corrosion-Resistant Material: 18-8 Stainless Steel construction offers excellent resistance to rust and chemical exposure, extending service life.
• Standardized Socket Head Design: Hex drive (3/32") and standard socket profile enable easy installation with common tools, reducing assembly time.
• Global Compliance Assurance: Meets ASME B18.3, DIN 912, and ISO 4762 standards, plus RoHS 3 and REACH regulations, ensuring international usability and safety.

Professional Applications & Engineering Value

This 4-40 UNC Thread Socket Head Cap Screw with Viton® O-Ring is engineered to address critical sealing challenges in demanding industrial environments. The combination of 18-8 Stainless Steel and a fluoroelastomer seal provides a reliable barrier against fluid and gas leaks, even under high-pressure conditions up to 1500 psi. Its Class 3A thread fit and coarse UNC threading ensure precise alignment and strong holding power, reducing the risk of assembly errors in automated machinery, fluid systems, and precision equipment. The screw’s fully threaded design and standardized socket head allow for consistent torque application, making it ideal for applications where space constraints and vibration resistance are concerns, such as in aerospace, automotive, and chemical processing industries.

Specification Summary & Compliance

This screw features a 4-40 UNC thread size with Class 3A thread fit for precise dimensional accuracy, adhering to ASME B18.3, DIN 912, and ISO 4762 manufacturing standards. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material integrity. The 1/2" length and standard socket head profile provide consistent performance across global applications, backed by the screw’s high tensile strength and temperature-resistant properties.